I will post a picture later, but I too have an RIA GI in .45ACP. I have modified it with a Hogue Monogrip (the one with finger grooves) and an arched mainspring housing. My preferred magazines are Checkmate Hybrids, but I also have some Chip McCormick's designated for range use.

Dammit gotta get some pics. I have a Kimber (series 1) Custom Classic Royal, Springfield Armory Stainless Steel Loaded and a recently aquired Springfield Champion Operator. I have to use combat tupperware at work but I love my 1911s.

Perhaps blasphemy to some, mine is not in .45 ACP, its in 10mm. Gorgeous gun and fun to shoot.

Colt Gold Cup Ten. It is the Gold Cup version of the Delta Elite. I dont have a picture of mine, but here is an identical pic from the interweb. I dont carry it much, I suppose it is my Sunday Go To Meetin' or BBQ gun.

No pics at the moment, but got a Colt 1991A1-bought it back in 1994, then last year got 2 1911's.
A Rock Island full size GI, in .38 super, just need to put on some novak sights on it. And a Springfield Gi champion(4" barrell), swaped out the arched mainspring housing that had the internal safety lock with a wilson combat flat mainspring housing, and also plan on putting novak sights on this one soon.

Well mine is old school, a genuine 1911 with a born-on date of 1918 according to the serial number. It was issued to my grandfather in WWII and he took it home with him. Presumably it was him who then had the slide and frame aggressively sanded down to get rid of the incriminating marking like "US government property." :D Nice piece of family history.